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Quantum

The Quantum project provides "network connectivity as a service". This page tracks Fedora Cloud SIG's effort to maintain Quantum in Fedora.

The packaging can be found at:

Quantum Plugins

Quantum supports a number of different backend implementations. These are called "plugins". The plugin used is defined in the quantum configuration file (core_plugin), for example for Open vSwitch: 

   core_plugin = quantum.plugins.openvswitch.ovs_quantum_plugin.OVSQuantumPluginV2

Below is a list of the supported plugins. Each plugin may use a different networking technology. Some may be hardware based, others software based.

Plugin Driver
Cisco quantum.plugins.cisco.network_plugin.PluginV2
Linux Bridge quantum.plugins.linuxbridge.lb_quantum_plugin.LinuxBridgePluginV2
Nicira quantum.plugins.nicira.nicira_nvp_plugin.QuantumPlugin.NvpPluginV2
Open vSwitch quantum.plugins.openvswitch.ovs_quantum_plugin.OVSQuantumPluginV2
RYU quantum.plugins.ryu.ryu_quantum_plugin.RyuQuantumPluginV2
NEC quantum.plugins.nec.nec_plugin_base.NECPluginV2Base
BigSwitch quantum.plugins.bigswitch.plugin.QuantumRestProxyV2
CoudBase Hyper-V quantum.plugins.hyperv.hyperv_quantum_plugin.HyperVQuantumPlugin
MidoNet quantum.plugins.midonet.plugin.MidonetPluginV2
brocade quantum.plugins.brocade.QuantumPlugin.BrocadePluginV2
PLUMGrid quantum.plugins.plumgrid.plumgrid_nos_plugin.plumgrid_plugin.QuantumPluginPLUMgridV2

The wiki will describe the installation and configuration of Open vSwitch and Linux Bridge plugins.

Open vSwitch

Quantum Service

The Quantum service is installed as follows: 

 #> sudo yum install openstack-quantum
 #> sudo yum install openstack-quantum-openvswitch

The Quantum service is configured as follows: 

 #> sudo quantum-server-setup

Note the above script will create the database and set the relevant configuration files to work with the open vswitch plugin. The script will also make use of environment variables for keystone configuration. There are: OS_TENANT_NAME, OS_USERNAME and OS_PASSWORD.

Once the service has been configured it can be started as follows: 

 #> sudo service quantum-server start
 #> sudo chkconfig quantum-server on

Compute Node

A compute node will need the agent to be configured and run. 

 #> sudo yum install openstack-quantum-openvswitch

The agent is configured follows: 

 #> sudo quantum-node-setup

Note the above script will set the relevant configuration files to work with the open vswitch plugin. The script will also make use of environment variables for keystone configuration. There are: OS_TENANT_NAME, OS_USERNAME and OS_PASSWORD.

A integration bridge needs to be created on the openvswitch. The bridge needs to be administratively created prior to running the agent. 

 #> sudo ovs-vsctl add-br br-int

Ensure that the interfaces are persistent after reboot. This is done by creating an interface file, for example for br-int: 

  DEVICE=br-int
  DEVICETYPE=ovs
  TYPE=OVSBridge
  ONBOOT=yes
  BOOTPROTO=none

Once configured it can be started as follows: 

 #> sudo service quantum-openvswitch-agent start
 #> sudo chkconfig quantum-openvswitch-agent on

Note if the host is rebooted then the openvswitch will create tap devices that existed on the switch prior to the reboot. This may affect the way in which the various quantum agents function. This is addressed by ensuring that the quantum-ovs-cleanup script is run at boot. This is done as follows: 

 #> sudo chkconfig quantum-ovs-cleanup on

IPAM

The Quantum DHCP agent enables VM's that are launched on a Quantum network to receive a IP address. The DHCP agent is part of the openstack-quantum package. This is installed as follows: 

 #> sudo yum install openstack-quantum

The DHCP agent is configured as follows (please select openvswitch for the plugin): 

 #> sudo quantum-dhcp-setup

Once the agent has been configured it can be started as follows: 

 #> sudo service quantum-dhcp-agent start
 #> sudo chkconfig quantum-dhcp-agent on

Note if the DHCP agent is not run on a compute node then the same installation for the compute node need to performed.

Floating IP Support

The Quantum L3 agent provides floating IP support for VM's that are launched. The L3 agent is part of the openstack-quantum package. This is installed as follows: 

 #> sudo yum install openstack-quantum

The L3 agent is configured as follows (please select openvswitch for the plugin): 

 #> sudo quantum-l3-setup

A external bridge needs to be created on the openvswitch. The bridge needs to be administratively created prior to running the L3 agent. 

 #> sudo ovs-vsctl add-br br-ex

Ensure that the interfaces are persistent after reboot. This is done by creating an interface file, for example for br-ex: 

  DEVICE=br-ex
  DEVICETYPE=ovs
  TYPE=OVSBridge
  ONBOOT=yes
  BOOTPROTO=none

Once the agent has been configured it can be started as follows: 

 #> sudo service quantum-l3-agent start
 #> sudo chkconfig quantum-l3-agent on

In order for the VM to be able communicate with the Nova meta data service then the quantum-metadata-agent needs to be run. 

 #> sudo service quantum-metadata-agent start
 #> sudo chkconfig quantum-metadata-agent on

Note if the L3 agent is not run on a compute node then the same installation for the compute node need to performed.

Linux Bridge

Quantum Service

The Quantum service is installed as follows: 

 #> sudo yum install openstack-quantum
 #> sudo yum install openstack-quantum-linuxbridge

The Quantum service is configured as follows: 

 #> sudo quantum-server-setup

Note the above script will create the database and set the relevant configuration files to work with the linux bridge plugin. The script will also make use of environment variables for keystone configuration. There are: OS_TENANT_NAME, OS_USERNAME and OS_PASSWORD.

Once the service has been configured it can be started as follows: 

 #> sudo service quantum-server start
 #> sudo chkconfig quantum-server on

Compute Node

A compute node will need the agent to be configured and run. 

 #> sudo yum install openstack-quantum-linuxbridge

The agent is configured follows: 

 #> sudo quantum-node-setup

Note the above script will set the relevant configuration files to work with the linux bridge plugin. The script will also make use of environment variables for keystone configuration. There are: OS_TENANT_NAME, OS_USERNAME and OS_PASSWORD.

Once configured it can be started as follows: 

 #> sudo service quantum-linuxbridge-agent start
 #> sudo chkconfig quantum-linuxbridge-agent on

IPAM and Floating IP support

This is the same as the openvswitch support. One just needs to select the linux bridge plugin.

Security Groups

Quantum now has support for security groups. In the case that Quantum supports security groups then the nova configuration file should be updated to support this: 

   [DEFAULT]
   security_group_api quantum
   firewall_driver = nova.virt.firewall.NoopFirewallDriver

The table below indicates which plugins support security groups.

Plugin Security Group Support
Cisco
none
Linux Bridge
Pass pass
Nicira
Pass pass
Open vSwitch
Pass pass
RYU
Pass pass
NEC
Pass pass
BigSwitch
none
CoudBase Hyper-V
Pass pass
MidoNet
none
brocade
Pass pass
PLUMGrid
none

The Quantum configuration file also requires some configurations. The firewall driver needs to be set. This is done in the [SECURITYGROUP] section.

Implementation firewall_driver
None quantum.agent.firewall.NoopFirewallDriver
IP tables (linux bridge) quantum.agent.linux.iptables_firewall.IptablesFirewallDriver
IP tables (ovs) quantum.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver

Note when Quantum security groups are used the Nova libvirt driver MUST be LibvirtHybridOVSBridgeDriver.

LBaaS

Nova

In order for Nova to support Quantum a number of parameters need to be set in the Nova configuration file so that Nova can interact with Quantum. The fields to be set are:

Quantum API driver: 

   network_api_class = nova.network.quantumv2.api.API

Keystone Authentication: 

   quantum_url =
   quantum_admin_tenant_name =
   quantum_auth_strategy = keystone
   quantum_admin_auth_url =
   quantum_admin_password =
   quantum_admin_username =

Metadata parameters (if the metadata service is enabled): 

   service_quantum_metadata_proxy = True

In addition to this a VIF can be set. By default this is: 

   libvirt_vif_driver = nova.virt.libvirt.vif.LibvirtGenericVIFDriver

If security groups are used with the openvswitch then 

   libvirt_vif_driver = nova.virt.libvirt.vif.LibvirtHybridOVSBridgeDriver

In order for the nova to make use of the LibvirtGenericVIFDriver driver then Quantum must be able to return the type of VIF binding. The table below shows which plugins support this operation:

Troubleshooting

Quantum Server

  • /etc/quantum/plugins.ini contains the specific plugin module. Check that this matches the intended plugin
  • /etc/quantum/quantum.conf contains information relevant to the server. Check that the server is running and that the bind_port is indeed up.
  • If the Quantum server does not start after reboot, and you are using mysql, then make sure that the Quantum server starts after the mysqld.service.

Quantum Plugin

  • /etc/quantum/plugins.ini contains the specific plugin module. Check that this matches the intended plugin
  • /etc/quantum/quantum.conf contains the specific plugin module. Check that this matches the intended plugin
  • /var/log/messages may contain information regarding the agent

OpenStack

  • It may be useful to look for errors in /var/log/nova/network.log and /var/log/nova/nova-dhcpbridge.log
  • Common configuration: /etc/nova/nova.conf contains the relevant quantum configuration.
   network_manager=nova.network.quantum.manager.QuantumManager
   quantum_connection_host=localhost
   quantum_connection_port=9696
   quantum_use_dhcp=True

Useful Quantum Links

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